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Date, Time & Other Calculators
This section collects practical everyday tools: calculating exact age and the time between two dates, adding days to a date, totalling work hours, converting units, working out a GPA, and generating random numbers or strong passwords.
All of them run in your browser. The password and random generators use your device, nothing you enter is sent to a server, and each page documents how the result is produced.
Age CalculatorExact age in years, months and days.Date Difference CalculatorDays, weeks and workdays between two dates.Date Add / SubtractAdd or subtract days from a date.Hours Worked CalculatorTotal hours between start and end time, minus breaks.Unit ConverterConvert length, weight, volume, speed, data and temperature.Password GeneratorCreate strong random passwords locally in your browser.GPA CalculatorCalculate your semester or cumulative GPA on the 4.0 scale.
How to choose the right calculator
Dates and schedules
Use the date difference and add days calculators for deadlines, and the hours calculator for timesheets.